<template>

 <div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar
      class="page-nav-bar"
      left-arrow
      title="黑马头条"
    ></van-nav-bar>
    <!-- /导航栏 -->

    <div class="main-wrap">
      <!-- 加载中 -->
      <div class="loading-wrap" v-if="loading">
        <van-loading
          color="#3296fa"
          vertical
        >加载中</van-loading>
      </div>
      <!-- /加载中 -->

      <!-- 加载完成-文章详情 -->
      <div class="article-detail markdown-body"  v-else-if="articles.title">
        <!-- 文章标题 -->
        <h1 class="article-title">{{articles.title}}</h1>
        <!-- /文章标题 -->

        <!-- 用户信息 -->
        <van-cell class="user-info" center :border="false">
          <van-image
            class="avatar"
            slot="icon"
            round
            fit="cover"
            :src="articles.aut_photo"
          />
          <div slot="title" class="user-name">{{articles.aut_name}}</div>
          <div slot="label" class="publish-date">{{articles.pubdate |relativetime}}</div>

          <!-- <follow-user v-model="articles.is_followed" :art_id="articles.aut_id" ></follow-user> -->
          <!-- <follow-user @changefollowuser="articles.is_followed=!articles.is_followed" :getfollowuser="articles.is_followed" :art_id="articles.aut_id" /> -->
          <follow-user v-model="articles.is_followed" :art_id="articles.aut_id" ></follow-user>
        </van-cell>
        <!-- /用户信息 -->

        <!-- 文章内容 -->
        <div ref="content" class="article-content" v-html="articles.content">这是文章内容</div>
        <van-divider>正文结束</van-divider>

        <!-- 评论列表组件 -->
        <!-- 展示文章的评论 -->
        <comment-list @click-reply="onclickReply" :list="list" :source="art_id" @on-success="total=$event"></comment-list>
        <!-- 展示评论的评论 -->
        <!-- <comment-list type="c"></comment-list> -->
         <!-- 底部区域 -->
    <div class="article-bottom">
      <van-button
        @click="commentpostpop=true"
        class="comment-btn"
        type="default"
        round
        size="small"
      >写评论</van-button>
      <van-icon
        name="comment-o"
        :badge="total"
        color="#777"
      />
      <!-- 收藏星星 -->
      <collect-article v-model="articles.is_collected" :art_id="articles.art_id"></collect-article>
      <van-icon
        color="#777"
        name="good-job-o"
      />
      <van-icon name="share" color="#777777"></van-icon>
    </div>
      </div>
      <!-- /加载完成-文章详情 -->

      <!-- 加载失败：404 -->
      <div class="error-wrap" v-else-if="is404">
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>
      <!-- /加载失败：404 -->

      <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div class="error-wrap" v-else>
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button @click="loadArticledetails" class="retry-btn">点击重试</van-button>
      </div>
      <!-- /加载失败：其它未知错误（例如网络原因或服务端异常） -->
    </div>

    <!-- /底部区域 -->
    <!-- 弹出层 -->
    <van-popup v-model="commentpostpop" position="bottom"  >
      <comment-post @closepopup="commentpostpop=false;list.unshift($event)" :target="art_id+''"></comment-post>
    </van-popup>
    <!-- 评论的评论弹层 -->
    <van-popup v-model="commentuserpostpop" position="bottom"  style="height:100%">
     <comment-reply v-if="commentuserpostpop" :comment="comment" @close="commentuserpostpop=false" />
    </van-popup>
  </div>
</template>

<script>
import '@/styles/github-markdown.css'
import { ImagePreview } from 'vant'
import { getArticleDetails } from '@/api/article'
import FollowUser from '../../components/FollowUser.vue'
import CollectArticle from '../../components/CollectArticle.vue'
import CommentList from '../../components/CommentList.vue'
import CommentPost from '../../components/CommentPost.vue'
import CommentReply from '../../components/CommentReply.vue'
export default {
  name: 'ArticleIndex',
  components: { FollowUser, CollectArticle, CommentList, CommentPost, CommentReply },
  data () {
    return {
      articles: {},
      loading: true,
      is404: false,
      total: 0,
      commentpostpop: false,
      commentuserpostpop: false,
      list: [],
      comment: {}

    }
  },
  props: {
    art_id: {
      type: String,
      required: true
    }
  },
  computed: {
    messi () {
      return 2222
    }
  },
  watch: {},
  created () {
    this.loadArticledetails()
  },
  mounted () {},
  methods: {
    async loadArticledetails () {
      this.loading = true
      try {
        this.articles = await getArticleDetails(this.art_id)
        this.loading = false
        this.$nextTick(_ => {
          this.imagePreview()
        })
      } catch (error) {
        this.loading = false
        if (error.response && error.response.status === 404) {
          this.is404 = true
        }
        console.dir(error)
      }
    },
    imagePreview () {
      const contentEL = this.$refs.content
      const imgs = contentEL.querySelectorAll('img')
      const images = []
      imgs.forEach((item, index) => {
        images.push(item.src)
        item.onclick = function () {
          ImagePreview({
            images,
            startPosition: index
          })
        }
      })
    },
    onclickReply (val) {
      this.commentuserpostpop = true
      this.comment = val
    }

  }
}
</script>

<style scoped lang="less">
.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    .van-icon {
      font-size: 40px;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
}
</style>
